def application(environ, start_response):
     status = '200 OK'
     response_headers = [('Content-type','text/html')]
     start_response(status, response_headers)
     return ['<h1>Python Demo</h1><p>Project url: <a href="http://git.oschina.net/demothr/python">http://git.oschina.net/demothr/python</a></p><p>Guide : <a href="http://git.oschina.net/demothr/python#python">http://git.oschina.net/demothr/python#python</a></p><iframe src="http://git.oschina.net/paas_demo.html" frameborder="0" scrolling="no" width="500px" height="1500px"></iframe>']